B1268 – OBD-II DTC

OBD-II DTC B1268 – Servo Motor Potentiometer Defrost Circuit Failure

DTC B1268 meaning

DTC B1268 refers to a failure in the servo motor potentiometer circuit related to the defrost function in a vehicle’s climate control system. This code indicates that the vehicle’s onboard diagnostic system has detected an issue with the feedback signal from the potentiometer, which is responsible for regulating the position of the servo motor that controls airflow for defrosting.

DTC B1268 symptoms

Common symptoms associated with DTC B1268 may include:

• Inconsistent or ineffective defrosting performance
• Inability to adjust the defrost settings
• Erratic behavior of the climate control system
• Warning lights illuminated on the dashboard

DTC B1268 causes

Several factors can lead to the triggering of DTC B1268, including:

• Faulty servo motor or potentiometer
• Wiring issues such as shorts, opens, or corrosion
• Defective climate control module
• Software glitches in the vehicle’s control system

DTC B1268 seriousness

DTC B1268 is considered a moderate issue. While it may not immediately affect the vehicle’s drivability, it can lead to reduced comfort and visibility due to ineffective defrosting. Ignoring this code may result in further damage to the climate control system or related components.

How to diagnose DTC B1268

To diagnose DTC B1268, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the DTC.
2. Inspect the wiring and connectors related to the servo motor and potentiometer for damage or corrosion.
3. Test the servo motor and potentiometer for proper operation using a multimeter.
4. Check the climate control module for any software updates or faults.
5. Clear the DTC and perform a road test to see if the code returns.

How to fix DTC B1268 step-by-step instructions

To fix DTC B1268, follow these steps:

1. Inspect and repair any damaged wiring or connectors related to the servo motor and potentiometer.
2. If the servo motor or potentiometer is faulty, replace it with a new component.
3. Reprogram or update the climate control module if necessary.
4. Reconnect all components and ensure proper installation.
5. Clear the DTC using an OBD-II scanner and perform a road test to verify the fix.

How to erase DTC B1268

To erase DTC B1268, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the vehicle’s ignition without starting the engine.
3. Navigate to the DTC menu on the scanner and select the option to clear or erase codes.
4. Confirm the action and wait for the scanner to complete the process.
5. Disconnect the scanner and perform a test drive to ensure the code does not return.

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